If the Thomson model of the atom was correct, then the result of Rutherford's gold foil experiment would have been:

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Thomson's "plum pudding" model: positive charge is spread uniformly throughout the atom with electrons embedded in it.

If Thomson's model were correct:
- There would be no concentrated nucleus to cause large deflections.
- The diffuse positive charge would cause only small deflections.
- The electrons (very light) would slow down the -particles slightly, causing reduced speed.

So -particles would pass through with small deflections and reduced speed.

Answer: Option (4)

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